Within Bonilla Observation
What the Bonilla Photos Actually Show
Bonilla's 1883 solar photographs capture a genuine unexplained event, but the surviving images leave the objects' identity uncertain.
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- The Zacatecas solar observation
- Photographic records and reported objects
- Limits of the surviving evidence
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Introduction
The Bonilla photographs are the central physical record of the 1883 Zacatecas observation: a trained astronomer captured a series of dark forms crossing the Sun during a solar observation, producing one of the earliest photographic records of an unidentified sky phenomenon. The images show that José A. y Bonilla documented a real visual event, but they do not independently reveal what the objects were. The surviving evidence supports several possibilities, from nearby objects passing in front of the telescope to a much more distant astronomical event such as a fragmented comet.[Wikipedia]WikipediaBonilla observationBonilla observation
The importance of the photographs lies less in proving a particular explanation and more in the unusual combination of factors surrounding them: an identified observer, an observatory setting, photographic records, written notes, and a published scientific account. At the same time, the limitations of nineteenth-century photographic technology mean that the images preserve the occurrence of the phenomenon more clearly than its identity.[Wikipedia]WikipediaBonilla observationBonilla observation
The Zacatecas solar observation
José A. y Bonilla was directing observations at the Zacatecas Observatory in Mexico when he noticed dark shapes crossing the solar disc on 12 August 1883. The observation continued into the following day, during which Bonilla used photographic equipment to record the objects. His surviving report described hundreds of individual transits and included observations of their appearance and movement.[Wikipedia]WikipediaBonilla observationBonilla observation
The event was not initially framed as a mystery about spacecraft or as a claim of an extraordinary discovery. Bonilla recorded an unexpected astronomical observation and submitted his findings to the French astronomy journal L’Astronomie. The published account appeared in 1886, accompanied by discussion from the journal’s editor Camille Flammarion, who considered more conventional explanations possible.[Wikipedia]WikipediaBonilla observationBonilla observation
Bonilla’s position as an astronomer matters because the observation was not a casual report of lights in the sky. He was using an observatory instrument during planned solar work, creating a documentary trail that included photographic plates and written descriptions. This makes the case different from many later unidentified aerial reports that rely mainly on memory or interpretation of a brief sighting.[Wikipedia]WikipediaBonilla observationBonilla observation
Photographic records and reported objects
Bonilla reportedly produced 447 photographic records of the objects using the photographic methods available at the time. He described the forms as indistinct, “misty” or fuzzy in appearance, with some apparently showing dark extensions or trails. These details became important in later attempts to interpret what the images represented.[Wikipedia]WikipediaBonilla observationBonilla observation
The photographs themselves provide a limited but significant dataset. They show dark marks against the bright solar background, indicating that something crossed the telescope’s field of view during exposure. However, the plates do not contain the kind of structural detail that would allow researchers to identify the objects as aircraft, spacecraft, birds, insects, or other specific bodies. The evidence therefore establishes a transit event, not the nature of the transiting objects.[Wikipedia]WikipediaBonilla observationBonilla observation
Several features of the observation have driven later debate:
- The large number of objects: Bonilla’s count of 447 photographed objects suggests a sustained event rather than a single isolated anomaly.[Wikipedia]WikipediaBonilla observationBonilla observation
- The appearance of the objects: The reported haze-like quality and occasional trails have been interpreted differently by different researchers. Some have seen these descriptions as consistent with nearby objects out of focus, while others have argued they resemble fragmented material in space.[Wikipedia]WikipediaBonilla observationBonilla observation
- The lack of independent observations: Other observatories did not report a comparable solar transit at the same time, a point that has influenced both sceptical and alternative interpretations.[Wikipedia]WikipediaBonilla observationBonilla observation
The surviving photographs are therefore strongest as evidence of what Bonilla observed through his instrument, rather than as direct evidence for a specific physical explanation.
Why the objects remain difficult to identify
The original explanation discussed around the publication of Bonilla’s observations was that the objects could have been relatively close to the telescope, such as birds, insects, or dust. A nearby object crossing the telescope’s optical path could appear as a dark silhouette against the Sun, and its blurred appearance could result from being out of focus. Flammarion and the editors of L’Astronomie considered such possibilities because they did not find the observations sufficient to establish a distant astronomical cause.[Wikipedia]WikipediaBonilla observationBonilla observation
A later interpretation proposed a very different scenario. In 2011, researchers Héctor Javier Durand-Manterola, María de la Paz Ramos Lara, and Guadalupe Cordero argued that Bonilla may have recorded fragments of a disintegrating comet passing unusually close to Earth. Their analysis used Bonilla’s timing, descriptions of the objects, and transit characteristics to estimate a possible near-Earth cometary debris event.[arXiv]arxiv.orgInterpretation of the observations made in 1883 in Zacatecas (Mexico): A fragmented Comet that nearly hits the Earth…
That proposal explains some aspects of the record, particularly the descriptions of fuzzy objects and trails, but it remains an interpretation rather than a confirmed identification. The original photographs do not contain enough information to prove that the objects were comet fragments, and the surviving evidence does not eliminate simpler explanations involving objects near the telescope.[arXiv]arxiv.orgInterpretation of the observations made in 1883 in Zacatecas (Mexico): A fragmented Comet that nearly hits the Earth…
Limits of the surviving evidence
The Bonilla photographs are valuable because they preserve a moment of observation from the early history of astronomical photography. They demonstrate that an unusual phenomenon was recorded under controlled conditions by an experienced observer. However, the same qualities that make the images historically important also define their limits: nineteenth-century photographic equipment captured silhouettes and motion, not detailed physical characteristics.[Wikipedia]WikipediaBonilla observationBonilla observation
The key distinction is between observation evidence and identification evidence. The observation evidence is relatively strong: Bonilla saw something cross the solar disc, recorded it photographically, and documented the event. The identification evidence is much weaker: the photographs alone cannot determine whether the objects were atmospheric debris, living organisms, astronomical fragments, or another phenomenon.[Wikipedia]WikipediaBonilla observationBonilla observation
For the history of the Jose A. y Bonilla photograph (1883) case, this uncertainty is central. The photographs remain a genuine record of an unexplained sky event, but their lasting scientific value comes from preserving a difficult observation rather than providing a final answer about what crossed the Sun.
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Endnotes
1.
Source: Wikipedia
Title: Bonilla observation
Link:https://en.wikipedia.org/wiki/Bonilla_observation
2.
Source: arxiv.org
Link:https://arxiv.org/abs/1110.2798
Source snippet
Interpretation of the observations made in 1883 in Zacatecas (Mexico): A fragmented Comet that nearly hits the Earth...
3.
Source: Wikipedia
Title: José Bonilla (astronomer)
Link:https://en.wikipedia.org/wiki/Jos%C3%A9Bonilla%28astronomer%29
4.
Source: nature.com
Title: The Observation of Meteors | Nature
Link:https://www.nature.com/articles/029006c0.pdf
5.
Source: nature.com
Title: A Remarkable Meteor | Nature
Link:https://www.nature.com/articles/028300b0
6.
Source: nature.com
Title: A Remarkable Meteor | Nature
Link:https://www.nature.com/articles/028269b0
7.
Source: sis-group.org.uk
Link:https://www.sis-group.org.uk/news/2023/01/12/bonilla/
Source snippet
Society for Interdisciplinary StudiesJanuary 12, 2023 — Society for Interdisciplinary Studies The oldest and most up to date society for...
Published: January 12, 2023
Additional References
8.
Source: bibliotecaenigmas.com
Link:https://bibliotecaenigmas.com/?p=19022
Source snippet
OVNIS en el Sol, desde el Observatorio Meteorológico de Zacatecas – Biblioteca EnigmasMarch 21, 2025 — Inicio/Blog forteano/México fortea...
Published: March 21, 2025
9.
Source: youtube.com
Title: Top 10 Mysterious UFO Sightings
Link:https://www.youtube.com/watch?v=5dkZseelDN4
Source snippet
This video selection features documentaries and observational history overviews detailing Mexican astronomer José Bonilla's 1883 Zacateca...
10.
Source: spookyvalley.com
Title: His photographs may be the first images of unident
Link:https://spookyvalley.com/events/1883-jose-bonilla-observation/
Source snippet
José Bonilla UFO Observation | Spooky ValleyJuly 12, 2026 — JOSÉ BONILLA UFO OBSERVATION UFO Mexican astronomer José Bonilla photographed...
Published: July 12, 2026
11.
Source: planetabenitez.com
Title: un astronomo autor de la primera fotografia ovni
Link:https://planetabenitez.com/un-astronomo-autor-de-la-primera-fotografia-ovni/
Source snippet
Un astrónomo, autor de la primera fotografía OVNI. - J.J. BenítezNovember 11, 2023 — Image: FotosOvnis001 1883. Un astrónomo, autor de la...
Published: November 11, 2023
12.
Source: bhandaradccb.in
Title: The Day Earth Nearly Ended — and Only One Astronomer Noticed
Link:https://bhandaradccb.in/day-earth-nearly-ended-one-astronomer-noticed/
Source snippet
During routine solar observations on August 12 and 13, 1883, Bonilla noticed dark, fast-moving shapes cros...
13.
Source: activite-paranormale.blogspot.com
Title: en 1883 un astronome observe des
Link:https://activite-paranormale.blogspot.com/2026/06/en-1883-un-astronome-observe-des.html
Source snippet
En 1883, un astronome a observé des centaines d'OVNI près du Soleil - Activité-ParanormaleJune 27, 2026 — ACTIVITÉ-PARANORMALE La vérité...
Published: June 27, 2026
14.
Source: youtube.com
Title: Five of the Oldest UFO Photos
Link:https://www.youtube.com/watch?v=cskG_xT5Pgw
Source snippet
Top 10 Mysterious UFO Sightings - Fact or Fiction | Educational Videos by Mocomi Kids...
15.
Source: researchgate.net
Link:https://www.researchgate.net/publication/51945342_Interpretation_of_the_observations_made_in_1883_in_Zacatecas_Mexico_Afragmented_Comet_that_nearly_hits_the_Earth
16.
Source: researchgate.net
Link:https://www.researchgate.net/figure/Geometry-of-Bonillas-observation-Z-Zacatecas-M-Mexico-City-or-Puebla-and-O-is-the_fig1_51945342
17.
Source: spaceref.com
Link:https://spaceref.com/status-report/interpretation-of-the-observations-made-in-1883-in-zacatecas-a-fragmented-comet-that-nearly-hits-the-earth/